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#turn bluetooth on:
sudo /etc/init.d/bluetooth restart
# make it automatic on boot
sudo systemctl enable bluetooth
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# Follow this link
https://kumarvinay.com/how-to-enable-bluetooth-headset-microphone-support-in-ubuntu-20-04/
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cd /lib/firmware/rtl_bt
sudo ln -s rtl8761b_config.bin rtl8761bu_config.bin
sudo ln -s rtl8761b_fw.bin rtl8761bu_fw.bin